What duo in the Simpsons episode "Gump Roast" usually appear in the Treehouse of Horror episodes? 
Kang and Kodos
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Gump Roast
1787705
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Gump Roast
1787705
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Gump Roast
1787705
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Kang and Kodos
4498045
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Kang and Kodos
4498045
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Kang and Kodos
4498045